package nio.netty.client;

import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.DelimiterBasedFrameDecoder;
import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
import io.netty.handler.codec.string.StringDecoder;

public class EchoClient {

	public void connect(int port, String host) throws Exception {
		EventLoopGroup group = new NioEventLoopGroup();
		try {
			Bootstrap b = new Bootstrap();
			b.group(group).channel(NioSocketChannel.class)
					.option(ChannelOption.TCP_NODELAY, true)
					.option(ChannelOption.CONNECT_TIMEOUT_MILLIS,0)
					.handler(new ChannelInitializer<SocketChannel>() {
				@Override
				protected void initChannel(SocketChannel ch) throws Exception {
					ByteBuf delimiter = Unpooled.copiedBuffer("$_".getBytes());
					ch.pipeline().addLast(new DelimiterBasedFrameDecoder(1024, delimiter));
					//ch.pipeline().addLast(new FixedLengthFrameDecoder(20));
					//ch.pipeline().addLast(new LengthFieldBasedFrameDecoder(20));
					ch.pipeline().addLast(new StringDecoder());
					ch.pipeline().addLast(new EchoClientHandler());
				}
			});

			// 发起异步连接
			ChannelFuture f = b.connect(host, port).sync();

			f.channel().closeFuture().sync();
		} finally {
			group.shutdownGracefully();
		}
	}

	public static void main(String[] args) throws Exception {
		int port = 9001;
		String host = "127.0.0.1";
		new EchoClient().connect(port, host);
	}
}
